There are several games traditionally associated with Halloween parties. One common game is dunking or apple bobbing, which may be called "dooking" in Scotland in which apples float in a tub or a large basin of water and the participants must use their teeth to remove an apple from the basin. The practice is thought by some to have derived from the Roman practices in celebration of Pomona. A variant of dunking involves kneeling on a chair, holding a fork between the teeth and trying to drop the fork into an apple. Another common game involves hanging up treacle or syrup-coated scones by strings; these must be eaten without using hands while they remain attached to the string, an activity that inevitably leads to a very sticky face.

Some games traditionally played at Halloween are forms of divination. A traditional Scottish form of divining one's future spouse is to carve an apple in one long strip, then toss the peel over one's shoulder. The peel is believed to land in the shape of the first letter of the future spouse's name. Unmarried women were told that if they sat in a darkened room and gazed into a mirror on Halloween night, the face of their future husband would appear in the mirror. However, if they were destined to die before marriage, a skull would appear. The custom was widespread enough to be commemorated on greeting cards from the late 19th century and early 20th century.

Another game/superstition that was enjoyed in the early 1900s involved walnut shells. People would write fortunes in milk on white paper. After drying, the paper was folded and placed in walnut shells. When the shell was warmed, milk would turn brown therefore the writing would appear on what looked like blank paper. Folks would also play fortune teller. In order to play this game, symbols were cut out of paper and placed on a platter. Someone would enter a dark room and was ordered to put her hand on a piece of ice then lay it on a platter. Her "fortune" would stick to the hand. Paper symbols included: dollar sign-wealth, button-bachelorhood, thimble-spinsterhood, clothespin- poverty, rice-wedding, umbrella- journey, caldron-trouble, 4-leaf clover- good luck, penny-fortune, ring-early marriage, and key-fame.

The telling of ghost stories and viewing of horror films are common fixtures of Halloween parties. Episodes of television series and Halloween-themed specials (with the specials usually aimed at children) are commonly aired on or before Halloween, while new horror films are often released theatrically before Halloween to take advantage of the atmosphere.

Because Halloween comes in the wake of the yearly apple harvest, candy apples (known as toffee apples outside North America), caramel or taffy apples are common Halloween treats made by rolling whole apples in a sticky sugar syrup, sometimes followed by rolling them in nuts.

At one time, candy apples were commonly given to children, but the practice rapidly waned in the wake of widespread rumors that some individuals were embedding items like pins and razor blades in the apples in the United States. While there is evidence of such incidents, they are quite rare and have never resulted in serious injury. Nonetheless, many parents assumed that such heinous practices were rampant because of the mass media. At the peak of the hysteria, some hospitals offered free X-rays of children's Halloween hauls in order to find evidence of tampering. Virtually all of the few known candy poisoning incidents involved parents who poisoned their own children's candy.

One custom that persists in modern-day Ireland is the baking (or more often nowadays, the purchase) of a barmbrack (Irish: báirín breac), which is a light fruitcake, into which a plain ring, a coin and other charms are placed before baking. It is said that those who get a ring will find their true love in the ensuing year. This is similar to the tradition of king cake at the festival of Epiphany.

For More on the history of Halloween and other subjects mentioned here, be sure to check out wikipedia!

A good documentary about the origins of Halloween from the history channel.